Add a group to ExceptionGroup

Hello,

For a custom debug engine I will need to add a new group to the exception dialog (ExceptionGroup interface on EnvDTE90)

The documentation @ http://msdn.microsoft.com/en-us/library/microsoft.teamfoundation.framework.server.grouprenameexception.grouprenameexception(v=vs.110).aspx states that custom debug engines can add groups, but its not explained how (and the interface only allows enumeration)

Does anyone have an idea on how to add a group?

Thanks and regards

Erik